Sand-ramming machine



D. J. CAMPBELL.

SAND RAMMING MACHINE. YAPPLICATION FILED Nov.'22.1919.

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ATTORNEY D. J. CAMPBELL.

SAND RAMMING MACHINE. IAEPLICATION FILED NOV. 22, 1919.

- Patented Jan. 4,1921.

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PATENT OFFICE.

UNITED STATES DONALD J. CAMPBELL, 0F MUSKEGON HEIGHTS, MICHIGAN.

SAND-RAMMING MACHINE.

Specification of Letters Patent.

Patented Jan. 4, 1921.

Application filed November 22, 1919. Serial No. 340,023.

in the art to which it appertains to make aud use the same.

This invention relates to a mechanical sand ramming machine by means of which small quantities of sand may be continuously thrown into a molding flask around a pattern therein. The present construction comprises various improvements over that shown in my former application for patent, Serial No. 304,328, filed June 14, 1919, and is directed to simplifying the mechanism and at the same time accomplishin practically the same results. The invention consists of many novel details of construction and arrangement of parts all tending toward the simplifying of the mechanism and at the same time producing a practical and efficient machine capable of attaining the ends stated.

For an understanding of the invention and the construction embodying the same, refcrence may be had to the following description taken in connection with the accompanying d 'awings, in which;

Figure 1 is a partial side elevation and section taken substantially on the plane of the line 1-1 of Fig. 2 and looking in the direction indicated by the arrows, and

Fig. 2 is an elevation and section taken substantially on the plane of the line 22 of Fig. 1.

Like reference characters refer to like parts in the different views of the drawings.

The mechanism as .a whole is adapted to be moved back and forth on a suitable track 1 which is built up in the form of a tube open on its under side. Within the track,

carriage members 2 including rollers are.

mounted from which depend posts 3, the same being connected at their lower ends to the opposite ends of a bar 4. A post 5 is swiveled on and depends from the bar 4, at its lower end being connected to a yoke G by means of a pivot pin or rod 7. The

yoke includes two spaced apart depending arms 8 which at their lower ends have connection. by means of pivot members 9, with upstanding ears or lugs 10 cast integral with one of the members of the casing in which the sand wheel, later described, is rotatably mounted. The axis of the pivots 9 is at-right angles to the axis of the pivot 7 so that the sand wheel casing is mounted to have a practically universal movement about a vertical axis, as is ap mrent. The casing is formed of a member 11 of substantially cylindrical outline, one end of.

which is closed by an end plate 12 which, i

at its upper portion, is provided with a horizontal extension 13, the upper side of which lies in the same plane with the upper side of the part 11 of the casing. Likewise an annular inwardly extending flange 14 is cast integral with the plate 12 to come into conjunction with the edge of. the casing member 11, and said plate 12 is detachably secured in place by a plurality of bolts 15. These bolts pass through inwardly turned flanges 10 on a plate 17 which is used to close the opposite end of the casino member 11. Integral with the plate 17 lower and upper horizontal outwardly extending flanges 18 and 19 are cast, the same extending laterally for a short distance and maklng, together with a cover plate 20, an inclosure for the chain belt drive for the sand wheel as will later appear.

A shaft 21 extends through the casing and is mounted at its ends in suitable bosses 22 and 23 cast integral with the plates 12 and 20. This shaft is keyed to said bosses and is held against rotation.

The upper side of the casing makes a horizontal platform on which an electric motor 24 is mounted. The shaft 25 of the motor extends through the plate 17 and has a drive wheel 26 secured thereon. On the shaft 21 a sleeve 27 is mounted for rotation, it also extending through the plate 17 and having a suitable wheel 28 attached around which and the Wheel 26, a chain belt 29 is placed for driving the sleeve from the motor.

Sleeve 27 is rigidly secured to one member 30 of a sand wheel which is mounted to turn about the shaft 21. Said member 30 has annular outer and inner flanges 32 and 33 projecting therefrom adjacent its outer edges and near its center, respectively. The wheel is completed by a member 31 forming a circular late, and lying against said flanges 32 and 33 bein permanently secured in place b means screws. The sides 30 and 31 o the sand wheel project 5 at their outer edges beyond the flange 32, as indicated at 30 and 31*, thereby forming an annular trough entirely around the wheel. A cam 34 of circular form except at one point where it is cut to make a substantially flat surface 34 is formed integral with the shaft 21 and is located within the inner flange 33. The formation of the outer casing members 11 and 12 is such that the extensions 30 and 31 ride freel in but are relatively closely positioned to t e sides of a channel shaped annular way in the casing indicated at 35.

Sand is introduced into the casing and to the sand wheel through an inletconduit 36 to. which, adjacent its upper end, a spout or chute 37 is pivotally' connected. The chute is pivotally connected to permit it to change direction as the mechanism as a whole is moved back and forth on the track 1. The casing also has an outlet 38. at the opposite side to which a nozzle member 39 is connected by the universal joint connection shown at 40. The nozzle member is provided with a handle 41 whereby the op- 80 erator of the machine may turn it to different positions and thereby direct the sand to any point desired.

The sand wheel moves within the substantially cylindrical channel shaped uide therefor, the curved outer side of whic lies close to the edges of the extensions 30 and 31 of the sides of the wheel except at the upper side where the casin is completed by a curved plate 42, one en of which rests on a lip 43 integral with the casing, the op osite end being formed with a socket, as

indicated at 44, to fit over a suitable projection on the casing member. The plate is normally forced downwardly by spring 45 pressure. Around a rod 45 a coiled spring 46 under compression is placed, while a leaf spring 47 exerts pressure on a pin 48 as shown in Fig. 1, said rod 45 extending through one end of a curved plate 44 and the pin 48 bearing against the said plate adjacent its opposite end.

Within the sand wheel formed of the members 30 and 31 a plurality of rods 49 are slidably mounted being ositioned radially with respect to each ot er and to the sand wheel. Each at its inner end carries a roller 50 designed to bear against the cam 34 and each is normally forced inwardly by a coiled spring 51. Each at its outer end 6 is widened and reduced in thickness to form a vane 52 having a width substantially equal to the distance between the inner sides of the projecting annular lips '30 and 31* of the sand wheel.

When the motor is running the sand wheel is driven at high speed inside of the casing. The vanes 52 are projected when rollers 50 are riding on the curved portion of the cam 34 but when the flat portion is reached springs 51 serve to retract the same. The cam is so positioned that, with the wheel turning in the direction indicated by the arrows in Fig. 1, the projected vanes serve to pick up the sand which has been entered into the casing through the inlet 36 and carry it around so that it may be projected from the casing through the outlet 38. When a vane has reached vertical position and be ins to approach horizontal position its ro er comes to the flattened 30 portion 34 of the cam 34 whereupon the vane is retracted by its associated spring 51. This insures against the sand remaining against the vane and bein carried again around the wheel. The sand is thrown out through the outlet 38 with considerable force and thence through the nozzle 39 into the mold and against the pattern as directed by the operator of the .machine. The spring pressed cover plate 42 is of value to permit slight movement thereof should any hard substances, such as small particles of iron or the like, be present in the sand and get between the ends of the vanes and the cover plate. Otherwise breakage is liable to occur.

The mechanism is compact and is relatively sim le. The control for the electric motor indicated at 53 may be mounted upon a PIOjGCtlIfil bracket 54 cast integral with plate 20. e sand is thrown in small quantities but at close intervals from the outlet 38 and the force of throwing is sufficient to pack or ram the sand to the necessary ensity around the pattern in making molds.

I claim:

1. In a device of the character described, a casing having an inlet at one side and an outlet at an opposite side, a sand wheel rotatably mounted within the casing, said 11( wheel having an annular trough entirely around the same, means to drive the wheel,

a plurality of vanes carried by the wheel and normally projecting therefrom into said trough, and means for retracting each vane as it approaches said outlet to the casing, substantially as and for the purposes described.

2. In a device'of the character described,

a casing having an inlet for the entrance and an outlet for the projection of sand, a sand wheel rotatably mounted within the casing and provided with an annular trough entirely around the same, a fixed shaft mounted within the casing and extending through the sand wheel, a cam on the shaft within the wheel, a plurality of radially mounted vanes carriedbythewheel, and spring means tending norma ly to move the vanes inwardly,

the inner ends of said vanes riding against ing, a sleeve attached to the sand wheel and rotatably mounted on the shaft, means to drive said sleeve from the motor, and means mounted on the sand wheel and controlled by the cam for engaging with sand entered into the casing through the inlet and projecting it from the casing through the outlet, substantially as described.

4. In combination, a hollow casing. having an inlet at one side and an outlet at the opposite side, a sand wheel rotatably mounted within the casing, said wheel being provided with an annular trough entirely around the same, means for driving the tially as described.

wheel, means carried by the wheel and adapted to alternately project and retract radially with respect to the wheel and take sand entered into the casing through the inlet and .carry the same to the outlet, and

means for controlling said projection and retraction wherebysaid means, on the wheel is retracted before'reachin the outlet and projected after passing sai outlet, substan- 5. In combination, a casing having an inlet for the entrance of sand therein and an outlet for its roj ection therefrom, a yoke provided with epending arms between which said casing is pivotally suspended, a carriage to which the upper end of the yoke is pivotally b.

mounted on an axis positioned at right angles to the pivotal connection of the casing to the yoke, a track for car ing the carriage, a motor mounted on -t e casing be. tween the arms of the yoke, a sand wheel within the casing, means to drive the wheel 1 from the motor, and means carried by the sand wheel for receiving szmd entered into the casing through the inlet and projecting the same in small quantities at close in tervals from the outlet during the rotation of the sand-wheel, substantially as described. 6. In combinatlon, a casing having an inlet conduit at one side and an outlet conduit at the opposite side, a nozzle mounted at the end of the outlet conduit for universal movement with respect thereto, a shaft extendingthrough the casing, means forsecuring the shaft in fixed position with respect to the casing, a cam secured on the shaft having a part cut away to make a flat side, a sand wheel rotatably mounted on the shaft and inclosing the cam, said sand wheel having an annular trough entirely around the same, a plurality'of vanes mount ed radially between the sides of the sand wheel, rollers at the inner ends of said vanes adapted to ride against the cam, a spring associated with each vane tending to force the roller against the cam, and means to drive the sand wheel, said flat side of the cam being located on the same side of the axis of the shaft as the outlet conduit to he casing, substantially as and for the purposes described.

7. In combination, a hollow casing having an inlet and an outlet thereto, a fixed shaft extending therethrough, a sand wheel rotatably mounted on the shaft, a cam on the shaft within the sand wheel, said sand wheel I having an annular trough entirely around the same, radial vanes carried by the sand wheel and bearing at their inner ends against the cam, means carried by each vane for forcing its inner end against the cam,

a motor mounted on the upper side ,of the casing, and means for drivin from the motor, substantially as described. 8. In combinationg a hollow casing having an inlet at one side and an outlet at the opthe sand-wheel posite side, a sand wheel rotatably mounted therein, a motor secured to the upper side of the casin a shaft extending through the casing on w ichthe sand wheel is rotatably mounted, means for driving the shaft from the motor, means on the shaft within the sand wheel,- and means movably mounted on 'the sand wheel and-controlled by said means on the shaft whereby it islalternately' projected and retracted to engage with and carry sand when rojected from'adjacent the inlet portion of t e casing to the outletportion thereof, said retraction occurrm before-said outletportion is reached, an ro-j -jection after itis passed, substantially and for the purposes described. whereof I afiix m si nature.

In testimon ONA'LD J. C PB LL. 

